A medium-sized Antarctic penguin recognized by white eye-rings on a black face — one of the most-southerly breeding birds on Earth, completing 13,000 km annual migrations on sea ice.
Note: see also Emperor Penguin
There’s a separate detailed Emperor Penguin entry covering the largest penguin species. This entry covers the Adélie penguin, smaller and more numerous, which serves as a good representative of the seven Antarctic penguin species.
”Adélie” — a French explorer’s wife
The species is named for Adélie d’Urville, wife of the French explorer Jules Dumont d’Urville, who discovered the species during an 1840 Antarctic expedition. Adélie Land (in Antarctica) is named for the same person.
The penguin and the land share the name, both honoring a 19th-century Frenchwoman who never visited Antarctica herself.
A small penguin in a big landscape
Adélies are about 70 cm tall and weigh 3-6 kg — much smaller than the iconic emperor penguin (1.2 m, 30 kg). They breed in colonies of tens of thousands on rocky Antarctic coastal areas exposed by retreating sea ice in summer.
Their plumage is the classic “tuxedo penguin” — black back, white belly, with the distinctive white ring around each eye that distinguishes them from other species at a glance.
Long migrations on ice
Adélies migrate up to 13,000 km annually between breeding colonies and winter foraging grounds — but they travel on sea ice rather than open water. They need ice platforms to rest on and hunt from. This dependency makes them vulnerable to climate change: as Antarctic sea ice retreats, their migration corridors shrink.
Some populations have already declined dramatically. Other colonies have grown as new ice-free coastal terrain becomes available.
Stones as currency
During breeding season, Adélies build small stone-pile nests to keep eggs above wet melting snow. Stones are scarce in their nesting areas, and males collect them aggressively — sometimes stealing stones from neighboring nests. Females evaluate prospective mates partly based on stone-pile quality.
In some colonies, the stones are passed down across generations — the same nest sites used year after year, with stone collections growing over decades.
A controversial sex life
Antarctic explorer George Murray Levick (1910 expedition) documented penguin sexual behavior so frank that his observations were excluded from the official expedition report and remained suppressed for nearly a century. The behaviors — including same-sex pairings, mating with dead penguins, and sexual coercion — are now accepted parts of normal penguin biology, but they shocked Edwardian scientific sensibilities.